feat: add variables key_usage and customer_master_key_spec @syphernl (#27) what Added optional variables key_usage and customer_master_key_specUpdated GitHub configswhy To be able to use the created KMS key with DNSSEC in Route53. The defaults remain unchanged.references https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/kms_key#key_usagehttps://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/kms_key#customer_master_key_spec